Mortising-machine.



G. W. CAMPBELL.

MORTISING MACHINE.

APPLICATION FILED AUG.8, 1910 Patented Jan. 27, 191 i COLUMBIA PLANOGRAPH IO-.WASHINIJTON. 04 c.

GEORGE W. CAMPBELL, OF COLUMBUS, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO

THE PERFECTION MORTISE I/[AGHINE COMPANY, OF COLUMBUS, OHIO, A CORPO- RATION OF OHIO.

MORTISING-MACHINE.

Specification of Letters Patent.

Patented Jan. 27, 1914:.

Application filed August 8, 1910. Serial No. 576,097.

To all whom it may concern Be it known that I, GEORGE \V. CAMPBELL, a citizen of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Mortising-Nlachines, of which the following is a specification.

My invention relates to improvements in mortising machines, and it particularly relates to improvements upon the machine described in Letters Patent No. 921,795, issued to me May 18th, 1909.

An object of my invention is to provide means for more readily adjusting certain parts of the mechanism of the device.

A further object of my invention is to provide for effecting a more perfect feed of the cutting tool.

A further object of my invention is to improve and simplify the construction and make more effective the operation of the machine set forth in my patent referred to.

The invention consists in the constructions and combinations of parts hereinafter described and set forth in the claims.

In the accompanying drawings; Figure l is a longitudinal sectional elevation of my improved device. Fig. 2 is a side elevation of the same with some of the parts broken away. Fig. 3 is a detail in section of a portion of the operating mechanism for the cutting tool. Fig. i is a section through the frame showing one of the adjustable operating devices for the operating pawls.

Like parts are represented by similar characters of reference in the several views.

The general construction and operation of the machine is the same as that set forth in my prior patent, a, as in the patent, repsenting the main frame, having at one end the clamp a with suitable thumb-screws a for clamping the frame to the work. Mounted upon the main frame by suitable pivots or journals is the usual driving wheel 5 having on its outer periphery the usual offset beveled gear b which is adapted to engage with the pinion I) mounted within the tool carrying sleeve, 0. As in said patent the tool carrying sleeve is pivoted at its rear end to the main frame a through the L-shaped arm a projecting from the main frame to form a support for the said tool carrying sleeve, said sleeve being pivoted to the arm a concentric to the main driving wheel I); said sleeve being formed at its forward end with the housing 0 in which the pinion b is located, and said sleeve be ing extended from the bearing 0 which extension extends between the guide a and a formed on the main frame. As in said patent referred to, the mortise forming tool is formed of a bit (Z, attached to the end of a shank or shaft (Z which extends through the sleeve 0, with its rear end inserted in a hearing or socket e in a movable block 6, said shaft being secured in the socket in a manner described in the patent. The shaft is provided with the usual keyway (Z in which projects a key If in the pinion b so that the shaft will always revolve with the pinion but is able to slide longitudinally through the same.

f is an oscillating head such as described in the patent, which is pivoted to the frame by the screw-threaded pin or stud f at its forward end. This head 7 is provided with the same slotted opening f described in the said patent, which opening receives the device for oscillating the head the construction of this oscillating device, however, be-

ing different from that described in the pat-' ent and forms one of the improvements of this application, the description thereof being as follows: Projecting in the slotted opening 7' is a square block f, of a size to snugly but freely fit the slotted opening. This block f is pivotally mounted upon the pin 7, (Fig. 3) being secured in position by the headed screw 7'; this pin 7 projecting from the slide 7, which is square in cross section, and fits a recess f formed in the side of the crank head f The other side of this crank head has a stud P which is journaled in the main frame a, said stud having a reduced screw threaded portion 7 which is screwed into the hub of the gear 9 so that as said gear is revolved, an oscillatingmovement will be imparted to the head f. The slide f is provided with a screwthreaded opening through which extends a screw f located in the crank head f one end of the screw having a slotted head f and the other having a reduced portion which extends through the wall of the crank head, where it terminates in a further reduced screw-threaded portion which receives the nut f; this nut being screwed up against the shoulder formed by the reduced portion so as to hold the screw in position in the head but at the same time permit it to turn freely therein. The construction described permits of a wider range of adjustment and amore ready adjustment of the part that projects into the slotted opening f so that the extent of oscillation of the head f can be readily regulated to a nicety, by turning the screw f in a manner which will be well understood.

The free end of the oscillating head f has the same pawl carrying arm hof the patent, pivoted at its middle as shown at k and carrying at its outer extremities the usual feeding pawls 72?; the springs 7L3 tend to thrust the pawls inwardly and against a sliding block 6 the block being provided with ratchet teeth 6 for this purpose. In my previous patent referred to, theseratchet teeth were spaced equally apart. In my present construction, as shown, the distance between the teeth gradually decreases toward the rear. The distance between the teeth in the drawing, however, has been slightly exaggerated to better illustrate this feature. In actual practice the difference in distances between the first two teeth and the last two teeth is about one sixty-fourth of an inch, the distance between the other teeth gradually varying between the two extremes. By this construction it will be seen that the tool carrying shaft will be fed gradually slower as it travels in to the work, this slower feed being desirable for the reason that the farther the tool feeds the more vibration there will be and also because after the too-l reaches a certain depth dowel pins and the ends of panels are apt to be encountered which cause more vibration and strain on the machine. It has been found in practice that this construction also insures a more perfect feedin of the pawls and tools. The usual cam face l'i on the pawl carrying arm contact the projections a on the frame in a manner described in the prior patent. In the present case however, the frame is provided with slotted openings a7, shown in dotted lines in Fig. 2. Each of these projections has a reduced screwthreaded portion which extends through its slotted opening and is adapted to be clamped in any position therein by a thumb-nut a This construction provides for a greater range of adjustment than the series of openings shown in my prior patent referred to.

As in my prior patent motion is imparted to the block f through a train of gear 9 g and 9*, a gear 9 being the one previously referred to as having connected therewith the crank head 7. A handle or crank (not shown) attached to the main driving wheel 6 serves to rotate the said wheel and thus give mot-ion to the mortising tool and to the oscillating head f and parts carried thereby.

It has been found in practice that the action of the gear I) on the pinion 6 causes the carrying pawl to oscillate in one direction at a greater speed than in the other, in the construction described in my prior patent. To overcome this difficulty I have provided a retarding device in the nature of a spring 2' which is interposed between the L shaped arm a and the lug i on the sleeve 0; the arm and lug being provided with sockets shown in dotted lines in which the ends of the spring rest. It has been found that the use of this device causes a more even oscillatory movement of the two.

Having thus described my invention, I claim:

1. In a mortising machine, a cutting tool, and devices for feeding said tool comprising a rack having teeth arranged at clifferent distances apart, the teeth on the rear part of said rack being arranged closer together than those on the forward part, substantially as and for the purpose specified.

2. In a mortising machine, a cutting tool,

a carrier for said tool, and means for feed-' teeth on either side thereof and pivoted pawls together with means for operating said pawls, the teeth of said rack being arranged at varying distances apart, the dis tance between the teeth gradually decreasing from the front to rear, substantially as and for the purpose specified.

4. In a mortising machine, a pivoted cut ting tool, a carrier for said tool, a swinging head upon which said carrier is mounted, pawls 011 said swinging head and racks on said carrier, said rack having teeth arranged on either side thereof at varying distances apart, the distance between the teeth gradually decreasing from the front to rear, and means for causing said pawls to engage said carriers to operate said teeth, substantially as specified.

5. In. a mortising machine, a pivoted cutting tool, means for rotating said tool comprising a rotating gear, devices for oscillating said tool, and means for retarding the oscillation of said tool in the direction of the rotation of said gear, substantially as and for the purpose specified.

6. In a mortising machine, a pivoted cutting tool, means for rotating said tool comprising a rotating gear, devices for oscillatbetween said tool and a stationary part to retard the oscillation of said tool in the direction of the rotation of said gear, substantially as and for the purpose specified.

7. In a mortisingmachine, a pivoted tool holder, a cutting tool carried thereby, means for rotating said cutting tool comprising a rotatable gear, means for oscillating said holder and tool, and a spring arranged be- 10 tween said holder and a stationary part to retard the oscillation of the same in the direction of rotation of said gear, substantially as and for the purpose specified.

In testimony whereof, I have hereunto set my hand this 27th day of July, A. D. 1910.

GEORGE XV. CAlWIPBELL.

Witnesses:

BARTON GRIFFITH, M. R. THORNTON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, I). 0. 

